By request, I'm listing all objectives and rewards here. Many things are summarized, but this gives a good overview. See the mod for the flavor tied to each of these.

Kemmler is moved to The Vaults.

• Infamous Victory
  
  • Objectives: Destroy Quenelles, Miragliano, Trantino. Control The Vaults, Apuccini Mountains.
    
  • Rewards: Bound Awaken from the Grave, Underway stance, Double siege constructions, improved Raiding, Raise Dead discount. Dilemma deciding the fate of Tilea.
• Immortal Victory
  
  • Objectives: Find the Books of Nagash, win a new Final Quest Battle against Arkhan.
    
  • Rewards: Bound Liber Mortis, Staff of Nagash, Hexwraith summon abilities. Survivability buffs for Kemmler and Ethereal Units, improved Recovery and Spellcasting.
• Destined Victory
  
  • Objectives: Defeat Kemmler's crisis, an old foe oathbound for vengeance.
    
  • Rewards: Reduced enemy leadership, several powerful unique magical items.
• Woeful Victory
  
  • Objectives: Control 6 regions of Athel Loren, plus the Oak of Ages and King's Glade. Destroy Talsyn.
    
  • Rewards: Two powerful Return of the Lichemaster Regiments of Renown, strong Grave Guard and Black Knight buffs. Suitable Climate for Magical Forests, powerful forest battle army buffs.

---

• Badlands Victory
  
  • Objectives: Gain the Liche Staff, control the southern Badlands, defeat Wurrzag.
    
  • Rewards: +2 Army capacity and +10% income, plus combat bonuses vs Greenskins.
• Mortuary Victory
  
  • Objectives: Capture tens of thousands of battle captives, collect hundreds of canopic jars, construct royal burial chambers.
    
  • Rewards: Gain a background income of Canopic Jars, bonuses to hero recruitment, research, construction, and spellcasting. 4 free Caskets of Souls.
• Destined Victory
  
  • Objectives: Defeat Khatep's crisis, a mercenary force sent to crush his rise to power.
    
  • Rewards: Gain stronger, more ruthless armies.
• Homecoming Victory
  
  • Objectives: Defeat Arkhan, control Zandri and the Books of Nagash, win the new final Quest Battle for the Black Pyramid.
    
  • Rewards: Bound Time Amok Cataclysm spell, powerful diplomatic and recruitment bonuses.

Arkhan gains a dual start between the Black Tower and Karitamen's Tomb

• Tomb Raiding Victory
  
  • Objectives: Gain the Tomb Blade of Arkhan, unearth Karitamen's Burial Chamber landmark, win the new Quest Battle for Karitamen's Burial Chamber.
    
  • Rewards: Gain the unique magical items of Karitamen, increased Hero capacity, magic item drop chance, and recruit rank.
• Preparation Victory
  
  • Objectives: Find the books of Nagash, gain the Staff of Nagash, win the new final Quest Battle for the Black Pyramid.
    
  • Rewards: Dilemma where the Black Pyramid is activated. Unlock Raise Dead recruitment with unlimited low-tier Necromantic units. Bound raise dead for Liche Priests.
• Destined Victory
  
  • Objectives: Defeat Arkhan's crisis, a traitor in an irredeemable pact.
    
  • Rewards: Gain an old ally, extra low-tier unit capacity and buffs.
• Nagashite Victory
  
  • Objectives: Destroy Tomb Kings and Azhag, control Nagashizzar and Todtheim.
    
  • Rewards: Limited powerful Necromantic units available for Raise Dead recruitment. Crown of Sorcery unique item. Buffs to Necromantic units, corruption, and Allegiance. +3 Army cap.

---

A narrative mission appears to free the Imperial Dragon.

• Legitimacy Victory
  
  • Objectives: Gain control of Reikland and destroy its occupiers, win the new Battle of Bloodpine Woods quest battle, and gain 4000 Prestige.
    
  • Rewards: Gain +2 Captain capacity and improved recruit rank for Lords, Captains, Greatswords, and Reiksguard.
• Imperial Victory
  
  • Objectives: Ensure elector state capitals are owned by Empire factions and no Electors are at war with one another. Destroy major enemy factions within the empire.
    
  • Rewards: Gain Fealty from all Electors, doubled Elector unit xp gain, and a chance for Elector unit replenishment after battles.
• Destined Victory
  
  • Objectives: Defeat Karl's crisis, a host of corrupted traitors.
    
  • Rewards: Cheaper Watch buildings, Chaos attrition immunity, and army buffs vs Chaos.
• Reunited Victory
  
  • Objectives: Control Couronne, Kislev, and all Elector provinces. Defeat Archaon, Belekor, and Azhag, and have high Imperial Authority.
    
  • Rewards: Gain the Heroic Resilience ability, buffs to province development, and confederation of the major Empire factions. Trigger the Storm of Chaos quest battle.

A narrative mission appears to recruit Treehaka's Sea Axes, and to defeat the nearby forest goblins for favor with the High King.

• Scholarly Victory
  
  • Objectives: Obtain all of Gelt's unique items, build a Wizard's Conclave.
    
  • Rewards: Improved research, construction, and spellcasting. Gain extra capacity and recruit rank for Wizards. +1000 Arcane Essays
• Auric Victory
  
  • Objectives: Ensure northern Elector capitals are owned by Empire factions and destroy their nearby foes. Amass a treasury of 70000.
    
  • Rewards: Spend the 70000 gold to gain global Untainted and apply powerful Attrition to enemies in the northern provinces. Find a tome of rare magic.
• Destined Victory
  
  • Objectives: Defeat Gelt's crisis, a rebellion of border princes.
    
  • Rewards: Improved diplomacy and growth factionwide.
• Supreme Victory
  
  • Objectives: Gain the staff of Volans, ensure that all Elector capitals are owned by Empire factions, and defeat major Enemies to the south of the Empire.
    
  • Rewards: Greatly improved spell range, hero capacity and rank, and artillery rank and damage.

Volkmar is moved to Ostermark. A narrative mission appears to recruit the Death's Heads.

• Crusading Victory
  
  • Objectives: Control Mordheim, destroy the Sylvanian vampire factions.
    
  • Rewards: Extra post-battle movement, Unbreakable for Knights, Deathblow for Flagellants, and reduced Global recruitment duration.
• Purifying Victory
  
  • Objectives: Win battles against minor Undead factions in the Empire, collect the Books of Nagash.
    
  • Rewards: Choose between rewards for sealing away the books. Cheaper Watch buildings, Improved hero actions, line of sight, Untainted, and Ambush Defense. Accusation ability for all characters.
• Destined Victory
  
  • Objectives: Defeat Volkmar's crisis, a mighty awakened Vampire.
    
  • Rewards: Weapon Strength for armies vs undead, The Courage of Sacrifice ability for characters, Unbreakable for Free Company Militia and Characters, a Silencing aura for Witch Hunters.
• Martyrdom Victory
  
  • Objectives: Destroy major nearby Chaos factions, control any 15 Dark Fortress Sites.
    
  • Rewards: Spell resistance for Volkmar's army, Sundering attacks for characters, Deathblow for State Troops, and army buffs against Chaos.

A narrative mission appears to recruit the Inner Circle of the Broken Sword.

• Wissenlander Victory
  
  • Objectives: Control Wissenland and Solland. Capture the wealthiest cities in the Southern Realms.
    
  • Rewards: Extra income, reduced recruitment cost, increased global recruitment capacity.
• Nulner Victory
  
  • Objectives: Defeat Tamurkhan, Drazhoath, Vlad, and Taurox. Win the Death's Timekeeper battle.
    
  • Rewards: Improved spellcasting and weapon strength. +15% campaign movement range for Elspeth's army after winning a battle.
• Destined Victory
  
  • Objectives: Defeat Elspeth's crisis, a sorcerous invasion from the Mountains.
    
  • Rewards: +2000 Schematics and bonuses to diplomacy and overcasting. Improved melee attack against undead and daemons.
• Magisterix Victory
  
  • Objectives: Control Fozzrik's Flying Fortress, defeat Teclis and Arkhan.
    
  • Rewards: Improvements to post-battle loot, research, and magic item steal chance. Access to powerful in-battle healing and explosion vortexes.

---

• Resurgent Victory
  
  • Objectives: Gain control of the four provinces of Couronne and Mousillon. Defeat Mousillon, Grom, and occupying Pirates. Build the Couronne Tournament Grounds.
    
  • Rewards: +100% Research rate, +1000 Chivalry
• Chivalric Victory
  
  • Objectives: Attain 10000 Chivalry and win the final Errantry battle.
    
  • Rewards: Improved Control and construction time.
• Destined Victory
  
  • Objectives: Defeat Louen's crisis, a mighty undead lord.
    
  • Rewards: Glorious Charge ability for Knights, Fear and Immune to Psychology for all armies. +1000 Chivalry
• Supreme Victory
  
  • Objectives: Control all of Bretonnia, build the Abbey of the Grail Companions.
    
  • Rewards: +1000 Chivalry, improved Growth, Control, Leadership, and construction time.

Water Supplies have been changed to Errantry Supplies, which provide attrition immunity from all natural terrain. Missions appear to recover lost banners and confederate the beleaguered Holy Wardens.

• Heroic Victory
  
  • Objectives: Defeat Mannfred, Arkhan, and the Sentinels of the Black Pyramid. Control nearby Bretonnian-occupied provinces.
    
  • Rewards: +1000 Chivalry, a large increase to the Peasant unit cap.
• Chivalric Victory
  
  • Objectives: Attain 10000 Chivalry and win Repanse's special final Errantry battle.
    
  • Rewards: +10 recruit rank for all characters, extra capacity for all heroes.
• Destined Victory
  
  • Objectives: Defeat Repanse's crisis, an old foe returned from the dead.
    
  • Rewards: +1000 Chivalry, permanent Blessing of the Lady ability for all units.
• Crusading Victory
  
  • Objectives: Destroy the Tomb Kings and Chaos worshippers in Araby. Control the coast of Araby and the provinces of Lyonesse.
    
  • Rewards: +1000 Chivalry, Extra post-battle campaign movement and base range. Errantry Supplies provide immunity to magical attrition.

• Questing Victory
  
  • Objectives: Complete Alberic's Grail vow, control two provinces, including Bordeleaux, and defeat Mousillon, Grom, and occupying Daemons of Nurgle.
    
  • Rewards: +1000 Chivalry, strong combat buffs for Alberic, Errantry Supplies enabled for all armies.
• Chivalric Victory
  
  • Objectives: Attain 10000 Chivalry and win the final Errantry battle.
    
  • Rewards: Improved recruit rank and action success chance for Paladins, improved recruit rank and replenishment for Knight units.
• Destined Victory
  
  • Objectives: Defeat Alberic's crisis, a great enemy pursuing the Errants from Lustria.
    
  • Rewards: +1000 Chivalry, army buffs for sea battles, immunity to sea, reef, storm attrition, and improved trade income.
• Maritime Victory
  
  • Objectives: Destroy several major pirate factions across the map, have several alliances, build Bordeleux's landmarks.
    
  • Rewards: +1000 Chivalry, permanent visibility for all sea regions, replenishment in foreign territory, extra campaign movement range and port income.

• Guided Victory
  
  • Objectives: Complete The Enchantress's Troth of Virtue, Control the three provinces nearest Carcassonne.
    
  • Rewards: Extra Damsel capacity, improved rank and Mastery of the Elemental Winds for Damsels and Prophetesses. Extra Winds for all armies.
• Chivalric Victory
  
  • Objectives: Attain 10000 Chivalry and win the final Errantry battle.
    
  • Rewards: Permanent magical attacks for all units.
• Destined Victory
  
  • Objectives: Defeat The Enchantress's crisis, an invader seeking magical power.
    
  • Rewards: Ashes and Dust bound cataclysm spell for The Enchantress.
• Supreme Victory
  
  • Objectives: Defeat Kemmler, Thorek, and Ikit Claw. Ensure that all of Athel Loren is free of corruption.
    
  • Rewards: +1000 Chivalry, permanent visibility for all regions.

---

• Troll Country Victory
  
  • Objectives: Gain control of the provinces of Troll Country, defeat Throgg and nearby occupying Norscans and Kislevites.
    
  • Rewards: Unlocks two unique troll Regiments of Renown. Frostbite attacks for all characters, extra recruit rank for trolls and army buffs vs Chaos.
• Slaughterer Victory
  
  • Objectives: Destroy Kislev and Reikland, loot, sack, raze, or occupy several settlements.
    
  • Rewards: Reduced human enemy leadership, reduced reinforcement time, improved looting and raiding income.
• Destined Victory
  
  • Objectives: Defeat Azhag's crisis, an ancient warlord seeking the Crown of Sorcery.
    
  • Rewards: Buffs against undead, desert attrition immunity.
• Sorcerous Victory
  
  • Objectives: Control magical sites in the Badlands, plus Nagashizzar. Obtain the Crown of Sorcery.
    
  • Rewards: Reduced Speed, increased Physical Resistance, and Undead attribute for Goblins. Doubled research rate, bound Awakened from the Grave spell, and increased bound Winds of Death spell uses. Aspect of the Dread Knight passive for Big 'Uns.